Question

explain how does the lubrication force reduces friction

Answer 1

Friction is a type of contact forces that occurs between any two bodies in relative motion. ... Lubrication helps fill in the uneven zig zag surface, tries to make it smoother in order to allow smooth relative motion between the surfaces, thereby reducing friction

Answer 2

friction is a one kind of force which works in the opposite direction of the applied force.
and friction is caused due to the rough surface of the material. so when lubricant is applied rough surface become smoother and it leads to the decrease in the friction
hope it will help you
thnks